/**
 * Project Name:dyrj-core
 * File Name:AesCbcUtil.java
 * Package Name:com.dyrj.utils
 * Date:2018年5月8日上午10:34:45
 * Copyright (c) 2018, zhang.xiangyu@foxmail.com All Rights Reserved.
*/
package com.dyrj.utils;

import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.security.spec.InvalidParameterSpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

/**   
 * @Title: AesCbcUtil.java 
 * @Package com.dyrj.utils
 * @Description: TODO(AES-128-CBC 加密方式) 
 * @author jw  
 * @date 2018年5月8日 上午10:34:45 
 * @version V1.0   
 */
public class AesCbcUtil {

	static {      
		//BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/      
		Security.addProvider(new BouncyCastleProvider());    
	}  
	
	public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception { 
		
		//被加密的数据      
		byte[] dataByte = Base64.decodeBase64(data);      
		//加密秘钥      
		byte[] keyByte = Base64.decodeBase64(key);      
		//偏移量      
		byte[] ivByte = Base64.decodeBase64(iv);          
		try {        
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");          
		SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");          
		AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");        
		parameters.init(new IvParameterSpec(ivByte));          
		cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化          
		byte[] resultByte = cipher.doFinal(dataByte);        
		if (null != resultByte && resultByte.length > 0) {          
		String result = new String(resultByte, encodingFormat);          
		return result;        
		}        
		return null;      
		} catch (NoSuchAlgorithmException e) {        
		e.printStackTrace();      
		} catch (NoSuchPaddingException e) {        
		e.printStackTrace();      
		} catch (InvalidParameterSpecException e) {        
		e.printStackTrace();      
		} catch (InvalidKeyException e) {        
		e.printStackTrace();      
		} catch (InvalidAlgorithmParameterException e) {        
		e.printStackTrace();      
		} catch (IllegalBlockSizeException e) {        
		e.printStackTrace();      
		} catch (BadPaddingException e) {        
		e.printStackTrace();      
		} catch (UnsupportedEncodingException e) {        
		e.printStackTrace();      
		}        
		return null;    
	}  
	
}
